Method for creating a substantially uniform temperature across a plastic sheet for delivery to an appliance liner thermoforming device
Patent 7101500 Issued on September 5, 2006. Estimated Expiration Date: 
May 31, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 31, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3115677 3157719 3471601 3502310 3684258 3713765 3728799 3744262 3837517 Method for the manufacture of thin-walled shaped articles of thermoplastic material InventorsAssigneeApplicationNo. 09867434 filed on 05/31/2001US Classes:264/37.17, Of gas utilized for heating or cooling264/40.1, WITH MEASURING, TESTING, OR INSPECTING264/322, Initially softening workpiece264/544, Starting material is nonhollow planar finite length preform or product is finite length34/619Including horizontal supportExaminersPrimary: Lee, Edmund H.Attorney, Agent or FirmForeign Patent References
International ClassB29C 51/02AbstractA sheet of plastic to be thermoformed into an appliance liner is brought to a substantially uniform temperature, preferably to a temperature differential of less than 5° F. throughout, by directing a fluid medium upon opposing side surfaces of the sheet. In the most preferred form of the invention, the fluid medium is constituted by air which is heated, impinged upon the opposing surfaces and recirculated, with the temperature and flow rate of the air being controlled based on sensed operating parameters. | |
